Mask



FIG. 1 is a front, top, and right side perspective view of a mask showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational side view thereof;

FIG. 5 is a right side elevational side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a rear, bottom, right side perspective view thereof;

FIG. 9 is a front, top, and right side perspective view showing that a front portion of the mask is at a left rotation position; and,

FIG. 10 is a front, top, and right side perspective view showing that the front portion of the mask is at a right rotation position.

The broken lines in the drawings depict portions of the mask that form no part of the claimed design. 

CLAIM The ornamental design for a mask, as shown and described. 